Patent GB-669829-A (GB)
Title: Pocket photographic camera
IPC: G03B17/17
Filed: 1948-11-15
Abstract: 669,829. Photographic cameras. PERLIN DEVELOPMENT CORPORATION. Nov. 15, 1948 [Nov. 28, 1947], No. 29616/48. Class 98 (i). A camera in which the film to be exposed is arranged in cylindrical form within a light-proof cylindrical cartridge in which it is exposed has a member arranged to engage an axially movable closure disc in the cartridge so as to open the cartridge during its insertion into the camera, means for removably securing the cartridge to the camera, means for deviating light coming through the open end of the cartridge from the objective of the camera on to the film in the cartridge and means for removably holding the cartridge in operative position with the rear wall of the cartridge closing the open end of a socket-like housing of the camera. As shown, a camera body 13 comprises a cylindrical shell 15 and a circular front wall 16 recessed at 17, 18 and having an exposure aperture 19. Segmental walls as 25 concentric with the shell 15 and on equal parallel chords receive between them the camera objective system comprising a lens 27 and a reflecting prism 26 by which images are formed adjacent the shell wall. A shutter disc 21 is pivoted on the wall 16 at 23 and lies in the circular recess 18 while a shutter blade 20 also pivoted on the wall 16 at 22 is movable within the parallel sided recess 17. A pin 56 on the blade engages within a pear-shaped aperture 57 in the disc so that on moving the trigger 54, which is integral with the blade, apertures 55, 61 in the blade and disc respectively register with each other in front of the exposure aperture 19. The blade 20 is formed with two bevelled faces 58, 59, and a dimple 60, Fig. 3 (not shown), in the outer cover 51, which is centrally apertured at 62 and has retaining flanges 62, engages one or other of these faces as the trigger is moved from either of its extreme positions so that the cover 51 is flexed outwardly until the dimple snaps over the ridge between the faces 58, 59, the cover 51 thereby acting as a shutter closing spring. A film cartridge 14 comprises a cylindrical shell 30 closed at one end by a friction fit or screw-threaded cap 31, and has a light-tight front closure member 32 urged towards the open end of the shell by a spiral spring 33 and having tongues 34 which engage in lips 35 formed at the open end of the shell. A strip of film 29 is disposed as a cylinder engaging the inner shell wall and its end is located by dimples 36 in the shell. To insert the cartridge into the camera, a notch 45 in the rim 39 of the cartridge is placed to receive a spring clip 44 carried by the camera. On inserting the cartridge, shoulders as 42 on the segmental walls of the camera engage in a circular recess 32a in the cartridge closure member 32 and force it towards the cap 31 thereby opening the film to the cainera objecttive, the cartridge then being rotated to the position shown in Fig. 1 and being retained in the camera by the clip 44 engaging over the rim 39 with the first notch 43. The film exposure area is changed by rotating the cartridge as a whole which is removed in a manner similar to its loading, and the clip 44 also serves as an exposure counter. A frame 48 slidably mounted in guides on the cover 51 of the camera cooperates when raised with a back sight 47 to form a view finder. As shown, the camera body is made integral by moulding in a synthetic resin, butit may be built up of preformed sheets bywelding. Provision for focusing by moving the lens 27 may be provided or the lens and prism may be formed integrally.